Learning about Languageppt课件教学实录

必修4

Unit 2 Working the land

Using language: Extensive reading & writing 一、Teaching aims Knowledge aims: 1 Discuss what do farmers put into the soil to make crops grow well? 2. Learn how to write an exposition.

Ability aims: 1. Develop the students’ reading skills by extensive reading. 2. Enable the students to learn about green food.

Emotional aims: 1. Enable Ss to talk about the difference between chemical and organic farming. 2. Develop the students’ spirit of cooperation and teamwork. 二、Teaching important points

1. Develop the students’ reading skills by extensive reading.

2. Enable the students to learn about organic farming methods.. 三、Teaching difficult points Enable the students how to write an exposition. 四、Teaching methods 1. Task-based teaching and learning 2. Cooperative learning and practice

3. Discussion 五、Teaching procedures Step1. Revision Review the new words and important points. Step2.Lead-in 1.What do farmers put into the soil to make crops grow well?

fertilizer

2.What’s the differences between chemical and organic farming?

(show them some pictures to see the differences) Step 3 Reading 1.

skimming Task 1

Skim the text, try to get the main

idea of each paragraph Para 1

Long-term use of

chemical_fertilizers can cause damage to the land and people’s health.

Para 2

Problems__ caused by chemical fertilizers. Para3

Farmers and customers turn to _organic farming. Para4

Other methods to keep _the soil fertile.

Task2

Sum up the main idea of the passage Chemical fertilizers may stop crop diseases, increase production but cause damage to the land and people while farming may keep the soil rich and free from chemicals. 2.

Scanning 金版学案学生用书P23 (1)From the passage, we can see organic farmers are those who______. 第

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A. grow crops with chemical fertilizers. B. grow crops with natural fertilizers C. produce organic fertilizers D. care for the environment (2)From the fourth paragraph, we know that______. A. it’s not good to plant grass between crops B. peanuts use the surface of soil C. peas and soybeans should be grown together with corn and wheat. D. vegetables that put down deep roots are harmful to the soil (3)According to the text, which of the following is NOT the problem caused by chemical fertilizer? A. Crop diseases can be stopped. B. Chemicals stay in the ground and underground water for a long time. C. The helpful bacteria and pests are killed as well as the harmful one. D. Many of these fertilizers are dangerous to people’s health. (4)How many ways do the organic farmers have to keep their soil fertile and healthy? A. 3

B. 4

C.5

D.6 3.

Language points (1 )These chemicals in the food supply build up

in people’s bodies over time.

build up

增强; 建立；开发

Hard working conditions build up character. 艰苦的工作条件能磨练人的性格。

(2)Many of these chemicals can lead to cancer or other illnesses. lead to: 导致；造成

Too much work and too little rest often lead to illness. 过量的工作和过少的休息会引起疾病。

All roads lead to Rome. 条条大道通罗马。

(3)They focus on keeping their soil rich and free of disease. focus on:集中(注意力，精力等）于

You should focus your attention on your work.把注意力集中在你的工作上。

Olympus: Focus on life. 奥林巴斯：瞄准生活。

(4)A healthy soil reduces disease and help crops grow strong and healthy. reduce vt.减少；缩小；降低；使……陷入某种更糟的状态

He is trying to reduce expenses. 他正试图减少开支。

We must gradually reduce the wage gap.

我们必须逐步缩小工资差距。

常用结构：

reduce sth. to...

减少到……

reduce sth. by...

减少了……

be reduced to

沦落为……

The shopkeeper reduced the price by ＄10. 店主把价格降了10美元。

The poor boy is reduced to begging. 那个可怜的孩子已沦为乞丐。

(5)This also keeps the air, soil, water and crops free from chemicals. keeps… free from /of: 使…免受（影响，伤害登）；使不含（有害物）

keep from:

阻止; 妨碍

I hope you will keep from doing anything rash. 我希望你不要做出任何鲁莽的事情来。

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(6)comment

vi.&vt.

表达意见；作出评论

n.［C&U］

评论；议论

常用结构：

comment on/about sth./sb. 对某事/某人进行评论

make comments/no comment on sth./sb. 对某事/某人进行评论/不进行评论

The scandal caused a lot of comment. 这件丑闻遭到很多议论。

“Will you resign, Minister?” “No comment!”“部长，您是要辞职吗?”“无可奉告。”

4.

Post Reading (Writing) exposition (1) The structure of this passage Para1 Topic Para2 Problems Para3 Advantages Para4 Several methods (2) writing tips in the text a. adverbs Recently, however, therefore; meanwhile; anyhow; thus ;otherwise; moreover; besides etc. b. connectives in paragraph 2 first; also ; in addition;…

first; second;

finally; last but not least ,etc. c. several phrases

focus on; lead to; keep… from; build up d. clauses make the passage logical and beautiful 1 …such as wheat or corn that need rich and fertile soil. 2 …planting peanuts that use the ground’s surface followed by vegetables that put down deep roots. Tips: we can use some adverbs, connectives, phrases and clauses to beautify our composition. (1)

Practice 请以“PLASTIC OR CLOTH BAGS?”为题模仿这篇文章的篇章结构和句子结构去写一篇说明文。

illustration（阐明）

Para1:Have a brief illustration of the topic. comparison

Para2: The problems caused by using plastic bags. (white pollution, hard to break down,be harmful to our health) Para3: The advantages of using cloth bags.

(can be used many times, save a lot of resources, We can make them by ourselves,

which is very interesting)

conclusion

Para4: Conclusion. (4) The following words may help you. Over the past half century, …have become very common ….

…welcomed them as a … way to …. Recently, however, we have been finding that they can cause damage to …, even …, to

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people’s health. What are some of the problems caused by …? First,…

With these discoveries, …are beginning to turn to …. Let’s use...., not only for ...., but also... Step 5 . Homework

1.Review language points and preview grammar. 2.Finish the writing .

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